WO2024057064A1 - Laminage à chaud avec éléments résiduels - Google Patents

Laminage à chaud avec éléments résiduels Download PDF

Info

Publication number
WO2024057064A1
WO2024057064A1 PCT/IB2022/058704 IB2022058704W WO2024057064A1 WO 2024057064 A1 WO2024057064 A1 WO 2024057064A1 IB 2022058704 W IB2022058704 W IB 2022058704W WO 2024057064 A1 WO2024057064 A1 WO 2024057064A1
Authority
WO
WIPO (PCT)
Prior art keywords
hot rolling
steel
toffset
residual elements
weight percent
Prior art date
Application number
PCT/IB2022/058704
Other languages
English (en)
Inventor
Thierry Iung
Ronan JACOLOT
Original Assignee
Arcelormittal
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelormittal filed Critical Arcelormittal
Priority to PCT/IB2022/058704 priority Critical patent/WO2024057064A1/fr
Priority to PCT/IB2023/059176 priority patent/WO2024057274A1/fr
Publication of WO2024057064A1 publication Critical patent/WO2024057064A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • This invention relates to a method for hot rolling a semi-finished steel product comprising residual elements resulting from the steel elaboration using steel scraps.
  • Steelmaking requires the use of iron-containing material, such as steel scraps, direct reduced iron or pig iron.
  • iron-containing material such as steel scraps, direct reduced iron or pig iron.
  • steel scraps In order to reduce the carbon footprint of the steel industry, the use of steel scraps is seen as key.
  • steel scraps contain residual elements, such as copper, chromium, molybdenum, nickel, tin, antimony, zinc and/or arsenic. The use of steel scraps is therefore not widely spread for all steel grades as those residual elements can have a detrimental effect on the steel properties.
  • the goal of this invention is therefore to increase the hot rolling processability of a semifinished steel product made, at least partly, from steel scraps. This is achieved by a hot rolling method according to any one of claims 1 to 7.
  • the present invention relates to a method for hot rolling a steel semi-finished product comprising the steps of : i. elaborating a steel composition comprising in weight percent: 0.002 ⁇ C ⁇ 0.8, 0.1 ⁇ Mn
  • TOFFSET a hot rolling temperature increase able to offset the presence of said residual elements : Mo, Sn, Sb and/or As, on the mean flow stress resulting from the deformation applied during the hot rolling v. hot rolling said semi-finished product at an optimised hot rolling temperature T H R being:
  • T H R T H R TH + TOFFSET.
  • step i. can be done using any means such as for example a basic oxygen furnace, an open-hearth furnace and/ or an electric arc furnace.
  • the material charged is made of steel scraps and optionally hot metal coming from a blast furnace and/ or direct reduced iron.
  • steel scraps that can be used are referred to, in the EU-21 Steel Scrap specification, as old scraps (El or E3), new scraps (E8), shredded scraps (E40) or fragmentized scraps (E46).
  • step i. from 100 to 1000 kg of steel scraps per ton of hot metal is used.
  • step i. from 100 to 950 kg of steel scraps per ton of hot metal is used.
  • step i. from 100 to 900 kg of steel scraps per ton of hot metal is used.
  • step i. from 100 to 800 kg of steel scraps per ton of hot metal is used.
  • step i. from 100 to 600 kg of steel scraps per ton of hot metal is used.
  • step i. from 100 to 500 kg of steel scraps per ton of hot metal is used.
  • step i. from 200 to 400 kg of steel scraps per ton of hot metal is used.
  • the residual elements are the non-desired elements coming from the steel scrap.
  • the unavoidable impurities come from the elaboration process, e.g. oxides, nitride.
  • the step i., comprises a refining step.
  • This refining step includes a desulfurization step and/ or a dephosphorization step.
  • This refining step is preferably done in a ladle furnace.
  • the steel composition of the liquid steel can be estimated at the end of the elaboration step and/or at the beginning of the casting step. Preferably, such estimation is performed at the beginning of the casting of the semi-finished product.
  • the estimation of the steel composition is preferably performed by analysing lollipop samples from the hot metal ladle that is used to fill in the casting tundish or the ingot mould to obtain the semi-finished product.
  • the casting can be any type of casting process.
  • the casting is preferably a continuous casting.
  • the semi-finished product can be for example a billet, a bloom, a blank, a slab, a bar or an ingot. Such semi-finished products are then reheated and hot rolled to reduce their thickness to a target depending on their future use.
  • a rolling pattern is defined.
  • the person skilled in the art establishes a rolling pattern.
  • establishing the rolling pattern requires information on the steel such as the stress-strain curve, the composition and the initial microstructure of the steel to be hot rolled.
  • the rolling pattern includes, among other parameters, the reduction rate, the strain rate and the hot rolling temperature for each hot rolling stand (e.g; for each rolling pass) respecting mass flow equation.
  • the mean flow stress is equal to the area under the stressstrain curve from a strain e a to a strain ep.
  • Each hot rolling stand has a maximum stress it can apply.
  • the inventors proposed to increase the hot rolling temperature defined in the rolling pattern for a steel not comprising said residual elements, i.e. the theoretical finishing hot rolling temperature T H R_TH. This is done by defining a hot rolling temperature increase, OFFSET, able to offset the presence of said residual elements : Mo, Sn, Sb and/or As on the mean flow stress resulting from the deformation applied during the hot rolling.
  • the semi-finished product is hot rolled at a temperature T H R being :
  • T H R T H R TH + TOFFSET-
  • This newly defined hot rolling temperature allows to achieve the targeted reduction rate when applying the mean flow stress defined by the rolling pattern.
  • hot strip mills generally comprise a reheating step before the rolling step. Based on the required minimum hot rolling temperature at a rolling stand, e.g. the last hot rolling stand, it is possible to determine the required temperature at the end of the reheating step.
  • the hot rolling is done after the casting, as it is for some compact strip production mill, it is possible to influence the rolling temperature by varying the speed of the strip.
  • the hot rolling can be performed by any means able to hot roll a semi-finished steel product.
  • the hot rolling step is performed by a hot rolling mill comprising from three to eight rolling stands and even more preferably from five to seven rolling stands.
  • the hot rolling step is performed by a reversible rolling stand.
  • the theoretical finishing hot rolling temperature can be a single temperature value or can be a range of temperature.
  • the theoretical finishing hot rolling temperature is a range of temperature being from T H R_TH-MIN and T H R_TH-MAX
  • the semi-finished product is hot rolled at a temperature THR being THR TH MIN + TOFFSET ⁇ THR ⁇ THR TH MAX + TOFFSET.
  • the method comprises the establishment of a rolling pattern comprising a theoretical finishing hot rolling temperature for each hot rolling pass.
  • said rolling pattern also comprises a strain rate for each rolling pass.
  • said establishment of said rolling pattern is done in step iv.
  • TOFFSET is defined using a statistical model.
  • TOFFSET can be determined according to the following equation :
  • TOFFSET a * [Mo%] + b * [Sn%] + c * [Sb%] + d * [As%], wherein [Mo%] is the weight percent of Molybdenum, [Sn%] is the weight percent of tin, [Sb%] is the weight percent of antimony and [As%] is the weight percent of arsenic, and a, b, c and d are coefficients representing the impact of respectively molybdenum, tin, antimony and arsenic on the the mean flow stressresulting from the deformation applied during the hot rolling.
  • said TOFFSET is defined for the last active rolling stand.
  • the rolling pattern defines a strain rate and a hot rolling temperature for the last rolling stand.
  • the theoretical mean flow stress at the theoretical finishing hot rolling temperature is calculated.
  • the theoretical mean flow stress is the one where said residual elements are not taken into account.
  • the real mean flow stress, taking into account the residual elements at the theoretical finishing hot rolling temperature is also calculated to show the influence of the residual elements.
  • the hot rolling temperature increase TOFFSET is defined using the following formula :
  • T H R T H R TH + TQFFSET, wherein T H R is the optimised hot rolling temperature, TQFFSET is the hot rolling temperature increase and T H R_TH is the theoretical finishing hot rolling temperature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)

Abstract

Procédé de laminage à chaud d'un acier comprenant les étapes consistant : i. à élaborer une composition d'acier comprenant en pourcentage en poids : 0,002 ≤ C ≤ 0,8, 0,1 ≤ Mn ≤ 3, Si ≤ 2, Al ≤ 2, Cr ≤ 0,5, Nb ≤ 0,08, Ti ≤ 0,1, le reste étant constitué de Fe, d'éléments résiduels et d'impuretés inévitables, par fusion de ferraille d'acier comprenant au moins l'un des éléments résiduels suivants : Mo, Sn, Sb, As, ainsi qu'éventuellement un métal chaud provenant d'un haut-fourneau et/ou d'une éponge de fer, ii. à estimer la composition d'acier liquide, iii. à couler un produit semi-fini avec ledit acier liquide, présentant une température de laminage à chaud théorique THR_TH, iv. à définir TOFFSET, une augmentation de température de laminage à chaud apte à décaler la présence desdits éléments résiduels : Mo, Sn, Sb et/ou As, sur la contrainte de flux moyenne résultant de la déformation appliquée pendant le laminage à chaud v. le laminage à chaud dudit produit semi-fini à une température de laminage à chaud optimisée THR étant : THR = THR_TH + TOFFSET.
PCT/IB2022/058704 2022-09-15 2022-09-15 Laminage à chaud avec éléments résiduels WO2024057064A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB2022/058704 WO2024057064A1 (fr) 2022-09-15 2022-09-15 Laminage à chaud avec éléments résiduels
PCT/IB2023/059176 WO2024057274A1 (fr) 2022-09-15 2023-09-15 Laminage à chaud avec éléments résiduels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2022/058704 WO2024057064A1 (fr) 2022-09-15 2022-09-15 Laminage à chaud avec éléments résiduels

Publications (1)

Publication Number Publication Date
WO2024057064A1 true WO2024057064A1 (fr) 2024-03-21

Family

ID=83558157

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/IB2022/058704 WO2024057064A1 (fr) 2022-09-15 2022-09-15 Laminage à chaud avec éléments résiduels
PCT/IB2023/059176 WO2024057274A1 (fr) 2022-09-15 2023-09-15 Laminage à chaud avec éléments résiduels

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/IB2023/059176 WO2024057274A1 (fr) 2022-09-15 2023-09-15 Laminage à chaud avec éléments résiduels

Country Status (1)

Country Link
WO (2) WO2024057064A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264206A1 (fr) * 2008-04-10 2010-12-22 Nippon Steel Corporation Tôles d'acier à haute résistance présentant un excellent équilibre entre l'aptitude à l'ébarbage et la ductilité et une excellente endurance à la fatigue, tôles d'acier revêtues de zinc et procédés pour leur production
EP3260565A1 (fr) * 2015-02-20 2017-12-27 Nippon Steel & Sumitomo Metal Corporation Tôle d'acier laminée à chaud

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264206A1 (fr) * 2008-04-10 2010-12-22 Nippon Steel Corporation Tôles d'acier à haute résistance présentant un excellent équilibre entre l'aptitude à l'ébarbage et la ductilité et une excellente endurance à la fatigue, tôles d'acier revêtues de zinc et procédés pour leur production
EP3260565A1 (fr) * 2015-02-20 2017-12-27 Nippon Steel & Sumitomo Metal Corporation Tôle d'acier laminée à chaud

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
AUTORENKOLLEKTIV: "Spurenelemente im Stahl - Moeglichkeiten zur Beeinflussung im Smelzbetrieb", SPURENELEMENTE IN STAEHLEN, VERLAG STAHLEISEN, DUESSELDORF, DE, 1 January 1985 (1985-01-01), pages 19 - 22, XP002433212 *
OLIVIER ROD: "Iron and steel scrap : its significance and influence on further developments in the iron and steel industries", 7 December 2006 (2006-12-07), United States, XP055468670, ISBN: 978-92-1-116634-7, Retrieved from the Internet <URL:http://www.jernkontoret.se/globalassets/publicerat/forskning/d-rapporter/d819.pdf> [retrieved on 20180419] *

Also Published As

Publication number Publication date
WO2024057274A1 (fr) 2024-03-21

Similar Documents

Publication Publication Date Title
CN102632082B (zh) 基于性能预报模型的热轧带钢力学性能的动态控制方法
CN107641759A (zh) 基于csp流程生产薄规格热成形钢的方法
JP2009503264A (ja) 方向性電磁鋼ストリップの製造方法
CA2270450A1 (fr) Procede pour la surveillance et la gestion de la qualite de produits lamines obtenus par laminage a chaud
CN102102141A (zh) 改善取向硅钢板组织均匀性的热轧工艺
IL155426A (en) Method to create a hot strip of magnesium
CN107099729A (zh) 热连轧超快冷工艺生产薄规格耐磨钢nm450的方法
CN108486480A (zh) 一种薄规格热轧双相钢板的制造方法
CN109280743B (zh) 一种轧辊用高强度耐磨钢及其生产方法
CN100560773C (zh) 一种高强度耐疲劳钢材及其制造方法
CN113430468A (zh) 一种薄规格屈服强度800MPa级高强钢及其生产方法
CN103974787B (zh) 穿孔轧制用工具
CN110205461A (zh) 一种高碳高锰耐磨钢板的制造方法
CN106967924B (zh) 重型装载机轮胎保护链用钢及其生产方法
CN1216174C (zh) 冷轧用低碳低硅钢带生产工艺
US20120305212A1 (en) Process and device for producing hot-rolled strip from silicon steel
CN108624815A (zh) 含V、Nb、Ti非调质预硬型塑料模具钢及其制备方法
WO2024057064A1 (fr) Laminage à chaud avec éléments résiduels
JPH0380846B2 (fr)
WO2024057065A1 (fr) Laminage à chaud avec éléments résiduels
CN107699798A (zh) 610MPa级热轧免酸洗汽车结构钢板及其生产方法
CN106978566A (zh) 一种铁道车辆用耐大气腐蚀钢及其制备方法
CN106756528A (zh) 一种高氮中锰钢薄带及其近终成形制备方法
CN105239002A (zh) 340MPa级连退冷轧汽车结构钢板及其生产方法
JPH0565263B2 (fr)

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22783563

Country of ref document: EP

Kind code of ref document: A1